Euclase
| Colour | Blue, Green, Clear |
|---|---|
| Mohs hardness | 7.5 |
| Lustre | Vitreous |
| Streak | White |
| Crystal system | Monoclinic |
| Transparency | Transparent, translucent |
| Cleavage | Perfect, perfect on {010}, imperfect on {110} {001} |
| Fracture | Conchoidal |
| Chemical formula | BeAlSiO 4 (OH) |
| Specific gravity | 2.99 - 3.1 |
What is Euclase?
Euclase is a beryllium aluminium hydroxide silicate mineral (BeAlSiO4(OH)). It crystallizes in the monoclinic crystal system and is typically massive to fibrous as well as in slender prismatic crystals. It is related to beryl (Be3Al2Si6O18) and other beryllium minerals. It is a product of the decomposition of beryl in pegmatites. Euclase occurs mostly in association with minerals like: quartz, muscovite, fluorite, albite, rutile, schorl and calcite.
How to identify Euclase
- Lustre: Vitreous.
- Hardness: Mohs 7.5 — hard enough to scratch glass.
- Streak: White.
- Habit: Monoclinic crystal system.
Euclase in different forms
Stones often confused with Euclase
Frequently asked questions
How hard is Euclase?
Euclase is Mohs 7.5 on the hardness scale.
What colour is Euclase?
Euclase is typically blue, green, clear (Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue, and light red).